Pokémon Ruby and Pokémon Sapphire are the third installments of the Pocket Monsters series of RPG, developed by Game Freak and published by Nintendo for the Game Boy Advance in 2002 / 2003. In the early screenshots we can see various beta differences:
Wynaut is green instead of blue Shroomish has a different sprite
more evil looking Sharpedo and different HP font hmm weird tornado
female sign should be red
different layout of trees different fisher bottom
the mart has a red roof and the sign should say mart
wow.. never seen a cave that hazy
Also, if you search in the codes of Ruby & Sapphire, you can find music from Generation 2 (Gold, Silver, Crystal). There was also two beta Pokemons: Shellos & Gastrodon. If you’ve played Pokemon Diamond/Pearl you sure know which these are, and they were actually going to be included in Ruby & Sapphire. Shellos & Gastrodon though were not supposed to look like they did in Diamond/Pearl. This how they were going to look like:
Shellos’s beta back sprite
Gastrodon’s beta back sprite
Thanks to FullMetalMC for the contribute!
More infos: Pokemon Ruby & Sapphire beta hacks
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